I really dont understand this, im a A/B Honor role student just need a little help.

Answer:
C.) Because i answered before The expresion is 15 <23
the've been open for 15 hours already, and cannot exceed 23 so
23 - 15 = 8.
They can be open for about 8 more hours.
The line graph should have 8 and anything BELLOW or BEFORE it.
Hope this helped! Please mark as brainliest! Thanks!
Step-by-step explanation: